OVA
Description
Ayumi Yamagou enters her first year at Ooarai Girls Academy as the main gunner and loader for the Rabbit Team's M3 Lee medium tank, operating its 75mm sponson-mounted cannon. She hails from Omitama City, Ibaraki Prefecture, and lives in the school dormitory with her parents and an older sister comprising her family.

Physically, Ayumi stands 160 cm tall, making her Rabbit Team's tallest and most physically developed member, a trait frequently noted in supplementary materials. She possesses long, dark hair – described variably as black with a hyacinth blue tint or dark blue – dark blue eyes, and visible freckles on her cheeks.

Her personality is boyish, straightforward, and energetic, though this also leads her to experience stress readily. She enjoys movement and physical activity, stating a preference for Aikido as a school subject. Ayumi practices Pilates daily (calling it "tirapise") and collects diet-related products. She dislikes being mistakenly called "Yamasato" or "Yamazato," a common error referencing a plum wine brand. Her favorite food is meat doria, her favorite flower the marguerite daisy (symbolizing sincerity), and her preferred tank the German Jagdtiger.

Within Rabbit Team, Ayumi and commander Azusa Sawa often act as the "straight men" countering the eccentricities of Aya Oono and Karina Sakaguchi. She facilitates communication by checking opinions with the quiet Saki Maruyama. Externally, she maintains a notable friendship with Duck Team's Taeko Kondou, interacting frequently.

Combat effectiveness is limited by the M3 Lee’s 75mm gun, which only elevates and depresses, requiring precise tank positioning for targeting. During the Anzio High School match, Rabbit Team encountered two Semovente da 75/18 tank destroyers while scouting. After an initial retreat, Ayumi scored a direct hit on one Semovente following stationary aiming and range-finding support from Aya Oono using the tank’s 37mm gun, prompting teammates to jokingly compare her gunnery to Miho Nishizumi’s. The destruction of her 75mm gun in the Pravda match significantly impaired the team. Before the tournament finals, Rabbit Team watched "Kelly’s Heroes," where Ayumi cried most prominently upon sympathizing with a character whose tank gun immobilized.

Non-combat activities include participation in a Duck Team study session documented in the drama CD "Test Studying!," where she nearly joined the volleyball club before retreating. She is recognized for her marketing prominence in Japan.